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The synthesis, characterization and biological evaluation of N-Tolueneferrocenecarboxamide labeled with technetium-99m ( 99m Tc-TTCC) is reported. Biological studies in Wistar rats showed the ability of  99m Tc-TPCC to cross the intact blood-brain barrier. In vivo biodistribution indicated that this complex had good brain uptake (1.32% ID/g at 5 min and 0.64% ID/g at 60 min) and good retention (about 50% of the activity was retained in the brain at 60 min post-injection). Regional brain distribution study showed that hippocampus, where the 5-HT1A receptor density is high, had the highest uptake (0.73% ID/g at 5 min p.i.) and the cerebellum, where the 5-HT1A receptor density is low, had the lowest uptake (0.12% ID/gID/g at 5 min p.i.). After blocking with 8-hydroxy-2-(dipropylamino) tetralin, the uptake of hippocampus was decreased significantly from 0.73% ID/g to 0.20% ID/g at 5 min p.i., while the cerebellum had no significant decrease. This result indicates that 99mTc complex has specific binding to 5-HT1A receptor.

Synthesis and initial biological evaluation of a novel Tc-99m radioligand as a potential agent for 5-HT1A receptor imaging